The screens will be placed between the Park Street and Brook Street entrances with refreshment outlets and public toilets nearby.
The parade involves 2,500 army, navy and air force representatives and will start soon after 10.30am with a march down the Long Walk to the castle, re-emerging from Castle Hill at about 11am. It will then pass down Castle Hill, Thames Street and Datchet Road.
The Queen and the Duke of Edinburgh will follow on the way to an arena at Home Park where a spectacular flypast will take place.
Most council car parks will be open as usual, except at River Street, Romney Lock and King Edward Avenue which will be closed. Extra free parking will be available at the review ground in Great Park, reachable off the A332 Sheet Street Road. Centrica in Maidenhead Road will run an enhanced service with three buses shuttling to Charles Street from 8.30am to 11.30am.
Shops and businesses will all be open as usual.
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